Collagens, the most abundant protein in mammals, provide a structural framework during tissue development and repair, and their structural and metabolic abnormalities are common to many chronic diseases (e.g. fibrosis and tumor growth). A simple synthetic molecule with selective binding affinity to collagen may offer new pathways for diagnosis and treatment of such diseases as well as facilitate production of functionalized collagen scaffolds for new and improved biomaterials applications in tissue engineering and drug delivery. This project focuses on i) developing new synthetic collagen mimetic peptides (CMPs) that bind specifically to natural collagen by a unique helix hybridization mechanism, and ii) creating collagen-based tissue engineering scaffolds that display morphogenic signals in a spatially and temporally defined manner. The long-term goals are to develop diagnostic and therapeutic methods that target disease-related fibrosis and to develop revolutionary methods for encoding cell-instructive signals onto collagen scaffolds in vivo for tissue regeneration and in vitro for transplantation therapy. As part of the efforts in achieving these long-term goals, the following specific aims are set forth in the proposed work: 1) Acquire a molecular level understanding of CMP-collagen hybridization interactions, 2) Develop new CMP architectures that will allow precise patterning of collagen scaffolds, and 3) Demonstrate spatial control of angiogenic events in collagen scaffolds with collagen- bound morphogenic factors by employment of CMPs.
In aim 1, a key hypothesis for CMP-collagen binding- that CMPs interact with the unfolded domains of collagen molecules by forming a hybrid triple helical complex- is tested by identifying molecular factors that affect binding events such as CMP's helical propensity and collagen's level of unfolding, and by isolating and studying the biophysical properties of CMP-collagen complexes.
In aim 2, new methods for spatio-temporal modification of collagen scaffolds are proposed that involve the design and synthesis of caged-CMPs that can be photo-triggered to fold and bind to collagen;the photo-triggered binding event will be investigated in the context of 2D and 3D collagen scaffold patterning.
And aim 3 attempts to control spatial organization of microvasculature formation in collagen scaffolds (for both in vivo and in vitro systems) by employment of CMPs and caged-CMPs conjugated to cell-instructive molecules. In the long run, completion of the proposed work will allow engineering of microvasculature networks for re-vascularizing native ischemic tissues as well as vascularizing ex-vivo engineered tissues. It may also offer new pathways for imaging pathologic scar tissue as well as facilitate production of functionalized collagen scaffolds for new and improved biomaterials applications in tissue engineering and drug delivery.

Public Health Relevance

This research project focuses on developing new synthetic molecules with a unique binding affinity to natural collagens, and creating collagen-based, cell-instructive tissue scaffolds that can control microvasculature network formation. This may allow revascularizing native ischemic tissues as well as vascularizing ex-vivo engineered tissues. In addition, collagen-targeting molecules may offer new pathways for imaging and treatment of pathological scar tissues such as fibrosis, arterial plaques, and tumors.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Research Project (R01)
Project #
5R01AR060484-02
Application #
8299014
Study Section
Biomaterials and Biointerfaces Study Section (BMBI)
Program Officer
Wang, Fei
Project Start
2011-07-11
Project End
2016-05-31
Budget Start
2012-06-01
Budget End
2013-05-31
Support Year
2
Fiscal Year
2012
Total Cost
$359,055
Indirect Cost
$134,055
Name
Johns Hopkins University
Department
Type
Schools of Engineering
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Converse, Matthew I; Walther, Raymond G; Ingram, Justin T et al. (2018) Detection and characterization of molecular-level collagen damage in overstretched cerebral arteries. Acta Biomater 67:307-318
Feinberg, Tamar Y; Zheng, Huarui; Liu, Rui et al. (2018) Divergent Matrix-Remodeling Strategies Distinguish Developmental from Neoplastic Mammary Epithelial Cell Invasion Programs. Dev Cell 47:145-160.e6
Hwang, Jeongmin; Huang, Yufeng; Burwell, Timothy J et al. (2017) In Situ Imaging of Tissue Remodeling with Collagen Hybridizing Peptides. ACS Nano 11:9825-9835
Zitnay, Jared L; Li, Yang; Qin, Zhao et al. (2017) Molecular level detection and localization of mechanical damage in collagen enabled by collagen hybridizing peptides. Nat Commun 8:14913
San, Boi Hoa; Hwang, Jeongmin; Sampath, Sujatha et al. (2017) Self-Assembled Water-Soluble Nanofibers Displaying Collagen Hybridizing Peptides. J Am Chem Soc 139:16640-16649
Hwang, Jeongmin; San, Boi Hoa; Turner, Neill J et al. (2017) Molecular assessment of collagen denaturation in decellularized tissues using a collagen hybridizing peptide. Acta Biomater 53:268-278
Bennink, Lucas L; Smith, Daniel J; Foss, Catherine A et al. (2017) High Serum Stability of Collagen Hybridizing Peptides and Their Fluorophore Conjugates. Mol Pharm 14:1906-1915
San, Boi Hoa; Li, Yang; Tarbet, E Bart et al. (2016) Nanoparticle Assembly and Gelatin Binding Mediated by Triple Helical Collagen Mimetic Peptide. ACS Appl Mater Interfaces 8:19907-15
Wahyudi, Hendra; Reynolds, Amanda A; Li, Yang et al. (2016) Targeting collagen for diagnostic imaging and therapeutic delivery. J Control Release 240:323-331
Chan, Tania R; Stahl, Patrick J; Li, Yang et al. (2015) Collagen-gelatin mixtures as wound model, and substrates for VEGF-mimetic peptide binding and endothelial cell activation. Acta Biomater 15:164-72

Showing the most recent 10 out of 22 publications